Removes trailing whitespace from a string.
This function doesn’t allocate or reallocate any memory;
string in place. Therefore, it cannot be used
on statically allocated strings.
The pointer to
string is returned to allow the nesting of functions.
g_strchug() and g_strstrip().
A string to remove the trailing whitespace from.
The data is owned by the caller of the function. The value is a NUL terminated UTF-8 string.